help please

[e.nickkk]

My truck started to run funny I scaned it it has codes po671 673 675 677 glow plug ckt code what would cause all four to code at once any ideas will be helpful thanks everyone



:gun:

 

[907DAVE]

I did not look up the descriptions, but my first guess would be the connector came un-plugged for that bank.

 

[e.nickkk]

That's was I was thinking also but everything looks good and connectors are clean